Sorry to say I don't have a step by step for this. There are 3 bolts that hold the belt tensioner on the engine. I believe all 3 are accessible even though there isn't a lot of room. The tough one will likely be the one that sort of hides under the power steering pump pulley. If you have to, you can remove the pump or loosen it enough to get to the bolt. The upper radiator hose may provide some issue to get your hand in there and the pulley out. If it does, you can take it off the engine side without losing a lot of coolant, and then make sure you top the coolant off prior to starting the car. This will eliminate any possible air pocket and overheating.

When you loosen the power steering pump, you may have to remove the bolts that hold the power steering lines tight. You don't have to take the lines off the pump to get room or to be able to move the pump, but this will give you some movement to get it out of the way if needed.

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